# perf stat -e 'btrfs:*' -a sleep 10 ## This is single device HDD, balance of a root fs was started before these 10 seconds of sampling. There are some differences in the statistics depending on whether there are predominately reads or writes for the balance, so clearly balance does predominately reads, then predominately writes. Unsurprising but the three tries I did were largely in agreement (orders of magnitude wise). http://fpaste.org/320551/06921614/ # perf record -e block:block_rq_issue -ag ^C ## after ~30 seconds # perf report ## Single device HDD, balance of root fs start before perf record. There's a lot of data, collapsed by default. I expanded a few items at random just as an example. I suspect the write of the perf.data file is a non-factor because it was just under 2MiB. http://fpaste.org/320555/14550698/raw/ # perf top ## Single device HDD, balance of root fs start before issuing this command, and let it run for about 20 seconds. This is actually not as interesting as I thought it might be, but I don't really know what I'm looking for. I'd need something else to compare it to. http://fpaste.org/320559/55070873/ Anyway, all of these are single device, so it's not apples/apples comparison, but it is a working (full speed for the block device) balance. Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
